[PATCH v2] dma-buf: add some tracepoints to debug.

[PATCH v2] dma-buf: add some tracepoints to debug.

[Xiang Gao]

From: gaoxiang17 <gaoxiang17@xiaomi.com>

I want to track the status of dmabuf in real time in the production environment. 
But now we can only check it by traversing the fd in the process or dmabuf_list.

For example:
    <...>-8342    [006] .....   199.626433: dma_buf_export: exp_name=system name=(null) size=32768 ino=2337 f_refcnt=2
    <...>-8342    [006] .....   199.626436: dma_buf_fd: exp_name=system name=(null) size=32768 ino=2337 fd=853 f_refcnt=2
    <...>-8342    [006] .....   199.626472: dma_buf_mmap_internal: exp_name=system name=system size=32768 ino=2337 f_refcnt=6
    <...>-3199    [006] .....   200.719182: dma_buf_get: exp_name=qcom,system name=acb size=184320 ino=2331 fd=111 f_refcnt=6
    <...>-894     [006] .....   199.632342: dma_buf_put: exp_name=system name=system size=32768 ino=2337 f_refcnt=2
    <...>-3199    [003] .....   213.402200: dma_buf_attach: dev_name=soc:qcom,xxx exp_name=qcom,system name=acb size=184320 ino=2331 f_refcnt=7
    <...>-1229    [004] .....   213.850270: dma_buf_detach: exp_name=qcom,system name=acb size=184320 ino=2331 f_refcnt=6

Signed-off-by: Xiang Gao <gaoxiang17@xiaomi.com>
---
 drivers/dma-buf/dma-buf.c      |  19 +++
 include/trace/events/dma_buf.h | 281 +++++++++++++++++++++++++++++++++
 2 files changed, 300 insertions(+)
 create mode 100644 include/trace/events/dma_buf.h

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index 2bcf9ceca997..8b5af73f0218 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -35,6 +35,9 @@
 
 #include "dma-buf-sysfs-stats.h"
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/dma_buf.h>
+
 static inline int is_dma_buf_file(struct file *);
 
 static DEFINE_MUTEX(dmabuf_list_mutex);
@@ -220,6 +223,8 @@ static int dma_buf_mmap_internal(struct file *file, struct vm_area_struct *vma)
 	    dmabuf->size >> PAGE_SHIFT)
 		return -EINVAL;
 
+	trace_dma_buf_mmap_internal(dmabuf);
+
 	return dmabuf->ops->mmap(dmabuf, vma);
 }
 
@@ -745,6 +750,8 @@ struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info)
 
 	__dma_buf_list_add(dmabuf);
 
+	trace_dma_buf_export(dmabuf);
+
 	return dmabuf;
 
 err_dmabuf:
@@ -779,6 +786,8 @@ int dma_buf_fd(struct dma_buf *dmabuf, int flags)
 
 	fd_install(fd, dmabuf->file);
 
+	trace_dma_buf_fd(dmabuf, fd);
+
 	return fd;
 }
 EXPORT_SYMBOL_NS_GPL(dma_buf_fd, "DMA_BUF");
@@ -805,6 +814,8 @@ struct dma_buf *dma_buf_get(int fd)
 		return ERR_PTR(-EINVAL);
 	}
 
+	trace_dma_buf_get(fd, file);
+
 	return file->private_data;
 }
 EXPORT_SYMBOL_NS_GPL(dma_buf_get, "DMA_BUF");
@@ -825,6 +836,8 @@ void dma_buf_put(struct dma_buf *dmabuf)
 		return;
 
 	fput(dmabuf->file);
+
+	trace_dma_buf_put(dmabuf);
 }
 EXPORT_SYMBOL_NS_GPL(dma_buf_put, "DMA_BUF");
 
@@ -998,6 +1011,8 @@ EXPORT_SYMBOL_NS_GPL(dma_buf_dynamic_attach, "DMA_BUF");
 struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,
 					  struct device *dev)
 {
+	trace_dma_buf_attach(dmabuf, dev);
+
 	return dma_buf_dynamic_attach(dmabuf, dev, NULL, NULL);
 }
 EXPORT_SYMBOL_NS_GPL(dma_buf_attach, "DMA_BUF");
@@ -1024,6 +1039,8 @@ void dma_buf_detach(struct dma_buf *dmabuf, struct dma_buf_attachment *attach)
 		dmabuf->ops->detach(dmabuf, attach);
 
 	kfree(attach);
+
+	trace_dma_buf_detach(dmabuf);
 }
 EXPORT_SYMBOL_NS_GPL(dma_buf_detach, "DMA_BUF");
 
@@ -1488,6 +1505,8 @@ int dma_buf_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma,
 	vma_set_file(vma, dmabuf->file);
 	vma->vm_pgoff = pgoff;
 
+	trace_dma_buf_mmap(dmabuf);
+
 	return dmabuf->ops->mmap(dmabuf, vma);
 }
 EXPORT_SYMBOL_NS_GPL(dma_buf_mmap, "DMA_BUF");
diff --git a/include/trace/events/dma_buf.h b/include/trace/events/dma_buf.h
new file mode 100644
index 000000000000..ab593dea4617
--- /dev/null
+++ b/include/trace/events/dma_buf.h
@@ -0,0 +1,281 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM dma_buf
+
+#if !defined(_TRACE_DMA_BUF_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_DMA_BUF_H
+
+#include <linux/dma-buf.h>
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(dma_buf_export,
+
+	TP_PROTO(struct dma_buf *dmabuf),
+
+	TP_ARGS(dmabuf),
+
+	TP_STRUCT__entry(
+		__string(exp_name, dmabuf->exp_name)
+		__string(name, dmabuf->name)
+		__field(size_t, size)
+		__field(ino_t, ino)
+		__field(long, f_refcnt)
+	),
+
+	TP_fast_assign(
+		__assign_str(exp_name);
+		spin_lock(&dmabuf->name_lock);
+		__assign_str(name);
+		spin_unlock(&dmabuf->name_lock);
+		__entry->size = dmabuf->size;
+		__entry->ino = dmabuf->file->f_inode->i_ino;
+		__entry->f_refcnt = file_count(dmabuf->file);
+	),
+
+	TP_printk("exp_name=%s name=%s size=%zu ino=%lu f_refcnt=%ld",
+		  __get_str(exp_name),
+		  __get_str(name),
+		  __entry->size,
+		  __entry->ino,
+		  __entry->f_refcnt)
+);
+
+TRACE_EVENT(dma_buf_fd,
+
+	TP_PROTO(struct dma_buf *dmabuf, int fd),
+
+	TP_ARGS(dmabuf, fd),
+
+	TP_STRUCT__entry(
+		__string(exp_name, dmabuf->exp_name)
+		__string(name, dmabuf->name)
+		__field(size_t, size)
+		__field(ino_t, ino)
+		__field(int, fd)
+		__field(long, f_refcnt)
+	),
+
+	TP_fast_assign(
+		__assign_str(exp_name);
+		spin_lock(&dmabuf->name_lock);
+		__assign_str(name);
+		spin_unlock(&dmabuf->name_lock);
+		__entry->size = dmabuf->size;
+		__entry->ino = dmabuf->file->f_inode->i_ino;
+		__entry->fd = fd;
+		__entry->f_refcnt = file_count(dmabuf->file);
+	),
+
+	TP_printk("exp_name=%s name=%s size=%zu ino=%lu fd=%d f_refcnt=%ld",
+		  __get_str(exp_name),
+		  __get_str(name),
+		  __entry->size,
+		  __entry->ino,
+		  __entry->fd,
+		  __entry->f_refcnt)
+);
+
+TRACE_EVENT(dma_buf_mmap_internal,
+
+	TP_PROTO(struct dma_buf *dmabuf),
+
+	TP_ARGS(dmabuf),
+
+	TP_STRUCT__entry(
+		__string(exp_name, dmabuf->exp_name)
+		__string(name, dmabuf->name)
+		__field(size_t, size)
+		__field(ino_t, ino)
+		__field(long, f_refcnt)
+	),
+
+	TP_fast_assign(
+		__assign_str(exp_name);
+		spin_lock(&dmabuf->name_lock);
+		__assign_str(name);
+		spin_unlock(&dmabuf->name_lock);
+		__entry->size = dmabuf->size;
+		__entry->ino = dmabuf->file->f_inode->i_ino;
+		__entry->f_refcnt = file_count(dmabuf->file);
+	),
+
+	TP_printk("exp_name=%s name=%s size=%zu ino=%lu f_refcnt=%ld",
+		  __get_str(exp_name),
+		  __get_str(name),
+		  __entry->size,
+		  __entry->ino,
+		  __entry->f_refcnt)
+);
+
+TRACE_EVENT(dma_buf_mmap,
+
+	TP_PROTO(struct dma_buf *dmabuf),
+
+	TP_ARGS(dmabuf),
+
+	TP_STRUCT__entry(
+		__string(exp_name, dmabuf->exp_name)
+		__string(name, dmabuf->name)
+		__field(size_t, size)
+		__field(ino_t, ino)
+		__field(long, f_refcnt)
+	),
+
+	TP_fast_assign(
+		__assign_str(exp_name);
+		spin_lock(&dmabuf->name_lock);
+		__assign_str(name);
+		spin_unlock(&dmabuf->name_lock);
+		__entry->size = dmabuf->size;
+		__entry->ino = dmabuf->file->f_inode->i_ino;
+		__entry->f_refcnt = file_count(dmabuf->file);
+	),
+
+	TP_printk("exp_name=%s name=%s size=%zu ino=%lu f_refcnt=%ld",
+		  __get_str(exp_name),
+		  __get_str(name),
+		  __entry->size,
+		  __entry->ino,
+		  __entry->f_refcnt)
+);
+
+TRACE_EVENT(dma_buf_attach,
+
+	TP_PROTO(struct dma_buf *dmabuf, struct device *dev),
+
+	TP_ARGS(dmabuf, dev),
+
+	TP_STRUCT__entry(
+		__string(dname, dev_name(dev))
+		__string(exp_name, dmabuf->exp_name)
+		__string(name, dmabuf->name)
+		__field(size_t, size)
+		__field(ino_t, ino)
+		__field(long, f_refcnt)
+	),
+
+	TP_fast_assign(
+		__assign_str(dname);
+		__assign_str(exp_name);
+		spin_lock(&dmabuf->name_lock);
+		__assign_str(name);
+		spin_unlock(&dmabuf->name_lock);
+		__entry->size = dmabuf->size;
+		__entry->ino = dmabuf->file->f_inode->i_ino;
+		__entry->f_refcnt = file_count(dmabuf->file);
+	),
+
+	TP_printk("dev_name=%s exp_name=%s name=%s size=%zu ino=%lu f_refcnt=%ld",
+		  __get_str(dname),
+		  __get_str(exp_name),
+		  __get_str(name),
+		  __entry->size,
+		  __entry->ino,
+		  __entry->f_refcnt)
+);
+
+TRACE_EVENT(dma_buf_detach,
+
+	TP_PROTO(struct dma_buf *dmabuf),
+
+	TP_ARGS(dmabuf),
+
+	TP_STRUCT__entry(
+		__string(exp_name, dmabuf->exp_name)
+		__string(name, dmabuf->name)
+		__field(size_t, size)
+		__field(ino_t, ino)
+		__field(long, f_refcnt)
+	),
+
+	TP_fast_assign(
+		__assign_str(exp_name);
+		spin_lock(&dmabuf->name_lock);
+		__assign_str(name);
+		spin_unlock(&dmabuf->name_lock);
+		__entry->size = dmabuf->size;
+		__entry->ino = dmabuf->file->f_inode->i_ino;
+		__entry->f_refcnt = file_count(dmabuf->file);
+	),
+
+	TP_printk("exp_name=%s name=%s size=%zu ino=%lu f_refcnt=%ld",
+		  __get_str(exp_name),
+		  __get_str(name),
+		  __entry->size,
+		  __entry->ino,
+		  __entry->f_refcnt)
+);
+
+TRACE_EVENT(dma_buf_get,
+
+	TP_PROTO(int fd, struct file *file),
+
+	TP_ARGS(fd, file),
+
+	TP_STRUCT__entry(
+		__string(exp_name, ((struct dma_buf *)file->private_data)->exp_name)
+		__string(name, ((struct dma_buf *)file->private_data)->name)
+		__field(size_t, size)
+		__field(ino_t, ino)
+		__field(int, fd)
+		__field(long, f_refcnt)
+	),
+
+	TP_fast_assign(
+		struct dma_buf *dmabuf = (struct dma_buf *)file->private_data;
+
+		__assign_str(exp_name);
+		spin_lock(&dmabuf->name_lock);
+		__assign_str(name);
+		spin_unlock(&dmabuf->name_lock);
+		__entry->size = dmabuf->size;
+		__entry->ino = dmabuf->file->f_inode->i_ino;
+		__entry->fd = fd;
+		__entry->f_refcnt = file_count(file);
+	),
+
+	TP_printk("exp_name=%s name=%s size=%zu ino=%lu fd=%d f_refcnt=%ld",
+		  __get_str(exp_name),
+		  __get_str(name),
+		  __entry->size,
+		  __entry->ino,
+		  __entry->fd,
+		  __entry->f_refcnt)
+);
+
+TRACE_EVENT(dma_buf_put,
+
+	TP_PROTO(struct dma_buf *dmabuf),
+
+	TP_ARGS(dmabuf),
+
+	TP_STRUCT__entry(
+		__string(exp_name, dmabuf->exp_name)
+		__string(name, dmabuf->name)
+		__field(size_t, size)
+		__field(ino_t, ino)
+		__field(long, f_refcnt)
+	),
+
+	TP_fast_assign(
+		__assign_str(exp_name);
+		spin_lock(&dmabuf->name_lock);
+		__assign_str(name);
+		spin_unlock(&dmabuf->name_lock);
+		__entry->size = dmabuf->size;
+		__entry->ino = dmabuf->file->f_inode->i_ino;
+		__entry->f_refcnt = file_count(dmabuf->file);
+	),
+
+	TP_printk("exp_name=%s name=%s size=%zu ino=%lu f_refcnt=%ld",
+		  __get_str(exp_name),
+		  __get_str(name),
+		  __entry->size,
+		  __entry->ino,
+		  __entry->f_refcnt)
+);
+
+#endif /* _TRACE_DMA_BUF_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
-- 
2.34.1

Re: [PATCH v2] dma-buf: add some tracepoints to debug.

[Steven Rostedt]

On Wed, 26 Nov 2025 00:29:49 +0800
Xiang Gao <gxxa03070307@gmail.com> wrote:

> +++ b/include/trace/events/dma_buf.h
> @@ -0,0 +1,281 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#undef TRACE_SYSTEM
> +#define TRACE_SYSTEM dma_buf
> +
> +#if !defined(_TRACE_DMA_BUF_H) || defined(TRACE_HEADER_MULTI_READ)
> +#define _TRACE_DMA_BUF_H
> +
> +#include <linux/dma-buf.h>
> +#include <linux/tracepoint.h>
> +
> +TRACE_EVENT(dma_buf_export,
> +
> +	TP_PROTO(struct dma_buf *dmabuf),
> +
> +	TP_ARGS(dmabuf),
> +
> +	TP_STRUCT__entry(
> +		__string(exp_name, dmabuf->exp_name)
> +		__string(name, dmabuf->name)
> +		__field(size_t, size)
> +		__field(ino_t, ino)
> +		__field(long, f_refcnt)
> +	),
> +
> +	TP_fast_assign(
> +		__assign_str(exp_name);
> +		spin_lock(&dmabuf->name_lock);
> +		__assign_str(name);
> +		spin_unlock(&dmabuf->name_lock);

The above isn't doing what you think it's doing. The name is assigned
before this by the above __string(name, dmabuf->name).

You really shouldn't be taking any locks in a tracepoint. A tracepoint is a
callback, that isn't called most of the time. You could be hiding very
hard to find deadlocks by taking a lock in a tracepoint callback.

You need to take the lock around the tracepoint call itself where it is
called in the code. Not in the TRACE_EVENT.

You may need to have something like:

@@ -220,6 +223,8 @@ static int dma_buf_mmap_internal(struct file *file, struct vm_area_struct *vma)
 	    dmabuf->size >> PAGE_SHIFT)
 		return -EINVAL;

+	if (trace_dma_buf_mmap_internal_enabled()) {
+		guard(spinlock)(&dmabuf->namelock);
+		trace_dma_buf_mmap_internal(dmabuf);
+	}
+
 	return dmabuf->ops->mmap(dmabuf, vma);
 }


The "trace_dma_buf_mmap_internal_enabled()" is a static branch, where it is
either a nop or a jump to the tracing code. It's not a normal conditional
branch. It acts the same as tracepoints themselves do.

> +		__entry->size = dmabuf->size;
> +		__entry->ino = dmabuf->file->f_inode->i_ino;
> +		__entry->f_refcnt = file_count(dmabuf->file);
> +	),
> +
> +	TP_printk("exp_name=%s name=%s size=%zu ino=%lu f_refcnt=%ld",
> +		  __get_str(exp_name),
> +		  __get_str(name),
> +		  __entry->size,
> +		  __entry->ino,
> +		  __entry->f_refcnt)
> +);

Below seems to be a lot of very similar TRACE_EVENT()s. A TRACE_EVENT() is
literally defined as:

#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
	DECLARE_EVENT_CLASS(name,			       \
			     PARAMS(proto),		       \
			     PARAMS(args),		       \
			     PARAMS(tstruct),		       \
			     PARAMS(assign),		       \
			     PARAMS(print));		       \
	DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));

That is, it is both a DECLARE_EVENT_CLASS() and a DEFINE_EVENT(). You can
make one DECLARE_EVENT_CLASS() and use many DEFINE_EVENT()s with it.

Each DECLARE_EVENT_CLASS() takes up around 4 to 5 kilobytes of memory. Each
DEFINE_EVENT() takes around 300 bytes to 1K of memory. The more
DEFINE_EVENT()s you use with a single DECLARE_EVENT_CLASS(), the more
memory you save. Please try to do that.

-- Steve



> +
> +TRACE_EVENT(dma_buf_fd,
> +
> +	TP_PROTO(struct dma_buf *dmabuf, int fd),
> +
> +	TP_ARGS(dmabuf, fd),
> +
> +	TP_STRUCT__entry(
> +		__string(exp_name, dmabuf->exp_name)
> +		__string(name, dmabuf->name)
> +		__field(size_t, size)
> +		__field(ino_t, ino)
> +		__field(int, fd)
> +		__field(long, f_refcnt)
> +	),
> +
> +	TP_fast_assign(
> +		__assign_str(exp_name);
> +		spin_lock(&dmabuf->name_lock);
> +		__assign_str(name);
> +		spin_unlock(&dmabuf->name_lock);
> +		__entry->size = dmabuf->size;
> +		__entry->ino = dmabuf->file->f_inode->i_ino;
> +		__entry->fd = fd;
> +		__entry->f_refcnt = file_count(dmabuf->file);
> +	),
> +
> +	TP_printk("exp_name=%s name=%s size=%zu ino=%lu fd=%d f_refcnt=%ld",
> +		  __get_str(exp_name),
> +		  __get_str(name),
> +		  __entry->size,
> +		  __entry->ino,
> +		  __entry->fd,
> +		  __entry->f_refcnt)
> +);
> +
> +TRACE_EVENT(dma_buf_mmap_internal,
> +
> +	TP_PROTO(struct dma_buf *dmabuf),
> +
> +	TP_ARGS(dmabuf),
> +
> +	TP_STRUCT__entry(
> +		__string(exp_name, dmabuf->exp_name)
> +		__string(name, dmabuf->name)
> +		__field(size_t, size)
> +		__field(ino_t, ino)
> +		__field(long, f_refcnt)
> +	),
> +
> +	TP_fast_assign(
> +		__assign_str(exp_name);
> +		spin_lock(&dmabuf->name_lock);
> +		__assign_str(name);
> +		spin_unlock(&dmabuf->name_lock);
> +		__entry->size = dmabuf->size;
> +		__entry->ino = dmabuf->file->f_inode->i_ino;
> +		__entry->f_refcnt = file_count(dmabuf->file);
> +	),
> +
> +	TP_printk("exp_name=%s name=%s size=%zu ino=%lu f_refcnt=%ld",
> +		  __get_str(exp_name),
> +		  __get_str(name),
> +		  __entry->size,
> +		  __entry->ino,
> +		  __entry->f_refcnt)
> +);
> +
> +TRACE_EVENT(dma_buf_mmap,
> +
> +	TP_PROTO(struct dma_buf *dmabuf),
> +
> +	TP_ARGS(dmabuf),
> +
> +	TP_STRUCT__entry(
> +		__string(exp_name, dmabuf->exp_name)
> +		__string(name, dmabuf->name)
> +		__field(size_t, size)
> +		__field(ino_t, ino)
> +		__field(long, f_refcnt)
> +	),
> +
> +	TP_fast_assign(
> +		__assign_str(exp_name);
> +		spin_lock(&dmabuf->name_lock);
> +		__assign_str(name);
> +		spin_unlock(&dmabuf->name_lock);
> +		__entry->size = dmabuf->size;
> +		__entry->ino = dmabuf->file->f_inode->i_ino;
> +		__entry->f_refcnt = file_count(dmabuf->file);
> +	),
> +
> +	TP_printk("exp_name=%s name=%s size=%zu ino=%lu f_refcnt=%ld",
> +		  __get_str(exp_name),
> +		  __get_str(name),
> +		  __entry->size,
> +		  __entry->ino,
> +		  __entry->f_refcnt)
> +);
> +
> +TRACE_EVENT(dma_buf_attach,
> +
> +	TP_PROTO(struct dma_buf *dmabuf, struct device *dev),
> +
> +	TP_ARGS(dmabuf, dev),
> +
> +	TP_STRUCT__entry(
> +		__string(dname, dev_name(dev))
> +		__string(exp_name, dmabuf->exp_name)
> +		__string(name, dmabuf->name)
> +		__field(size_t, size)
> +		__field(ino_t, ino)
> +		__field(long, f_refcnt)
> +	),
> +
> +	TP_fast_assign(
> +		__assign_str(dname);
> +		__assign_str(exp_name);
> +		spin_lock(&dmabuf->name_lock);
> +		__assign_str(name);
> +		spin_unlock(&dmabuf->name_lock);
> +		__entry->size = dmabuf->size;
> +		__entry->ino = dmabuf->file->f_inode->i_ino;
> +		__entry->f_refcnt = file_count(dmabuf->file);
> +	),
> +
> +	TP_printk("dev_name=%s exp_name=%s name=%s size=%zu ino=%lu f_refcnt=%ld",
> +		  __get_str(dname),
> +		  __get_str(exp_name),
> +		  __get_str(name),
> +		  __entry->size,
> +		  __entry->ino,
> +		  __entry->f_refcnt)
> +);
> +
> +TRACE_EVENT(dma_buf_detach,
> +
> +	TP_PROTO(struct dma_buf *dmabuf),
> +
> +	TP_ARGS(dmabuf),
> +
> +	TP_STRUCT__entry(
> +		__string(exp_name, dmabuf->exp_name)
> +		__string(name, dmabuf->name)
> +		__field(size_t, size)
> +		__field(ino_t, ino)
> +		__field(long, f_refcnt)
> +	),
> +
> +	TP_fast_assign(
> +		__assign_str(exp_name);
> +		spin_lock(&dmabuf->name_lock);
> +		__assign_str(name);
> +		spin_unlock(&dmabuf->name_lock);
> +		__entry->size = dmabuf->size;
> +		__entry->ino = dmabuf->file->f_inode->i_ino;
> +		__entry->f_refcnt = file_count(dmabuf->file);
> +	),
> +
> +	TP_printk("exp_name=%s name=%s size=%zu ino=%lu f_refcnt=%ld",
> +		  __get_str(exp_name),
> +		  __get_str(name),
> +		  __entry->size,
> +		  __entry->ino,
> +		  __entry->f_refcnt)
> +);
> +
> +TRACE_EVENT(dma_buf_get,
> +
> +	TP_PROTO(int fd, struct file *file),
> +
> +	TP_ARGS(fd, file),
> +
> +	TP_STRUCT__entry(
> +		__string(exp_name, ((struct dma_buf *)file->private_data)->exp_name)
> +		__string(name, ((struct dma_buf *)file->private_data)->name)
> +		__field(size_t, size)
> +		__field(ino_t, ino)
> +		__field(int, fd)
> +		__field(long, f_refcnt)
> +	),
> +
> +	TP_fast_assign(
> +		struct dma_buf *dmabuf = (struct dma_buf *)file->private_data;
> +
> +		__assign_str(exp_name);
> +		spin_lock(&dmabuf->name_lock);
> +		__assign_str(name);
> +		spin_unlock(&dmabuf->name_lock);
> +		__entry->size = dmabuf->size;
> +		__entry->ino = dmabuf->file->f_inode->i_ino;
> +		__entry->fd = fd;
> +		__entry->f_refcnt = file_count(file);
> +	),
> +
> +	TP_printk("exp_name=%s name=%s size=%zu ino=%lu fd=%d f_refcnt=%ld",
> +		  __get_str(exp_name),
> +		  __get_str(name),
> +		  __entry->size,
> +		  __entry->ino,
> +		  __entry->fd,
> +		  __entry->f_refcnt)
> +);
> +
> +TRACE_EVENT(dma_buf_put,
> +
> +	TP_PROTO(struct dma_buf *dmabuf),
> +
> +	TP_ARGS(dmabuf),
> +
> +	TP_STRUCT__entry(
> +		__string(exp_name, dmabuf->exp_name)
> +		__string(name, dmabuf->name)
> +		__field(size_t, size)
> +		__field(ino_t, ino)
> +		__field(long, f_refcnt)
> +	),
> +
> +	TP_fast_assign(
> +		__assign_str(exp_name);
> +		spin_lock(&dmabuf->name_lock);
> +		__assign_str(name);
> +		spin_unlock(&dmabuf->name_lock);
> +		__entry->size = dmabuf->size;
> +		__entry->ino = dmabuf->file->f_inode->i_ino;
> +		__entry->f_refcnt = file_count(dmabuf->file);
> +	),
> +
> +	TP_printk("exp_name=%s name=%s size=%zu ino=%lu f_refcnt=%ld",
> +		  __get_str(exp_name),
> +		  __get_str(name),
> +		  __entry->size,
> +		  __entry->ino,
> +		  __entry->f_refcnt)
> +);
> +
> +#endif /* _TRACE_DMA_BUF_H */
> +
> +/* This part must be outside protection */
> +#include <trace/define_trace.h>